212100012220 has 24 divisors (see below), whose sum is σ = 445591263600. Its totient is φ = 84805483392.

The previous prime is 212100012197. The next prime is 212100012227. The reversal of 212100012220 is 22210001212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 212100012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100012227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2107185 + ... + 2205544.

It is an arithmetic number, because the mean of its divisors is an integer number (18566302650).

Almost surely, 2^212100012220 is an apocalyptic number.

212100012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212100012220 is an abundant number, since it is smaller than the sum of its proper divisors (233491251380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212100012220 is a wasteful number, since it uses less digits than its factorization.

212100012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315197 (or 4315195 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212100012220 its reverse (22210001212), we get a palindrome (234310013432).

The spelling of 212100012220 in words is "two hundred twelve billion, one hundred million, twelve thousand, two hundred twenty".